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This depends entirely on the engine in question. Some timing belts/chains have tensioners that automatically set the tension for you. However many more have specific procedures to correctly tension the belt/chain. Do it wrong and it usually ends in tears. If you are changing it yourself you get a workshop manual i.e. a Haynes manual for your car and follow the procedure carefully.
Changing a timing belt/chain isn't usually too difficult, they do tend to be time consuming though as you have to take all the other bits off first to get to the timing gear (hence the high labour charge from garages).
I would always recommend chaning the timing gear (pulleys etc.) rather than just the belt as these all wear together and the cost of something failing is usually expensive
What else can I help you with?
Can timing belt burn?
A car's timing belt can start to melt and snap if it is fitted too tight. Most timing belts should have a half turn of play on them.
When should the timing belt be changed on a 1999 Chevy Malibu?
It does not have a timing belt, it has a chain.
When should you change the timing belt on a 2008 mercury mariner?
when should i change the timing belt on a mercury villager
When should the timing belt of a 2001 Oldsmobile aurora be changed?
there is no timing belt. It is a timing chain that requires no maintenance.
How do you replace the timing belt on1994 Mitsubishi Galant?
remoremove the timing belt cover, remove old belt after aligning timing marks on cams and crank gear if still in one pc. if broken belt, align marks, install belt-making sure marks are still aigned when belt is tight
Should a serpentine belt be loose or tight on a 1994 camaro?
it should be pretty tight, but no so tight that it stretches it
When should you change the timing belt on a 1999 grand am?
about 100,000 mile if it,s a timing belt
When should you change the timing belt on a 2000 Chevy?
A 2000 Chevy S10 does not have a timing belt.
When should the timing belt be changed on a 1998 BMW 318?
1998, 318 is fitted with a timing chain not a timing belt.
When should the timing belt be replaced on 2001 Impala?
It doesn't have a timing belt. It has a timing chain and it will last the life of the engine.
Why does timing jump?
on vehicles? maybe the timing belt lost teeth or isn't tight enough due to a failed or failing tensioner.
Does a 87 Camry have a timing belt or chain?
It should have a belt.
